Water-meter.



C. G. BRODIE.

WATER METER.

APPLICATION FILED "AR. 1. 1 14.

1,140,661k Patented May25,191 5.

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Water-Metersgof which the following isthe specification. v

This invention relates=to an improvement in water meters. I

The primary object ot the-invention is. to provide a watermeter which will enable the ascertainment ofthe necessary records without checking the supply through the main. l

provide a construction which-maybe conveniently connected to water mains-whichare -'now in use without materially alteringtheir construction. and at a small cost. r Broadly the present invention contemplates-the provision of a conical enlargement placed in the line of main whereby to cause the velocity of .the flow to slacken and consequentlythe pressure to increase whereby the indicator tube coming from the entrance to a suitable meter tube will show a lower pressure than that coming from the centralenlargement, while a tube taken from the exit in like manner will show a pressure trance showing only a very small loss of .head.

"The invention further contemplates a structure in which a difierential reading or pressure efiect between the two tubes which varies with the pressure and-therefore with thevelocity of the fluid passin through the meter tube, is presented an requires only a smallcalculation to give the quan- 40 tityof water which passes through the meter;

, Incarrying' out the invention two cones, the construction of which will be hereinafter described, will be placed together in such .a way that their smaller ends'are' directly. se- 1 cured'to the ends ofthe main itself and are '"diameter with it, thereby doing for using a throat I Ipiece. lowed to wor up'to its full capacitywhich fyofsmall mains. This construction also permits the differential pressure readings of .pressureeffects to. taken in two way warwuernn 1 srecifiseti of wh n Rel an 1 ueation filed March 7, 914; senaiim. 823,178.

a subject ofrthe Kingof Great Brit A furtherobject of the inventioniss to' nearly equal'to that coming from the err-- genceshould fi t teqM yz, 1915- seithen'between the pressure-in the-pressure -..tube' coming from the main just before the commencement of the meter -cone,.-and the tube coming from thecentral enlargement; Jon between the pressuregofthe second tube and a tubetaken ofi themain in a similar ,manner just after the endof the second cone.

.In' the accompanying. drawings, forming art hereof, ='Eigure.-1 is a 1 view 1n elevation showing the preferred embodiment :of my inventiomEi 2 is a'similar viewof a modi-- fled construction, and'Fig; 3is a fragmentary The meteritube consists of two truncated cones which are secured in any suitable manher together:- at their larger. ends (flangea piece. omitted-in the drawing). while their smaller ends are joined by another flange piece to the main. Thus in the drawing, Fig. 1, A is a divergent cone whose smaller end is boltedby the flange piece to the main G, and whose lar er end is joined up with the larger end 0% the convergent cone B, the smaller end of B being joined by another flange piece tothe main C. It is in fact a so conical enlargement of the main. From the top and sides of the smaller ends of the cones, a short distance from-the pointfrom which they spring, and fromthe top and sides of the largest part of the central enlargement, where the larger ends of the two cones join, three, fitve, seven, or more small tubes 7 are taken, which either meet in a common chamber F, situated on the top or sides of the meter tube or communicate with a common conduit which ends in the chamber F. These small pipes communicate with the interior of the meter tube and main. These small pipes or holes, may be three, five, seven or more in number, so as to provide against any accidental blocking of an of them. The chamber F, can be shut o from the pressure tubes H, .by tap G, when necessary;

The enlargement of the divergent cone A, should be very gradual to provide against 1 eddies,.and to permit the flow of water to completely fill the approximate it may vary from 2 to 10 according to circumstances; The length of the side of this tube; its angle of diver- 5 or 6 though scone should be approximately nine times. the internal diameter of the main more-or less, but a longer or shorter side may be used if circumstances require it. The convergent cone B, may be more abrupt in its contraction and its length of side will be,

5 considerably less than that of the divergent cone A. Its length should be approximately three and a half to four and a half times the internal diameter of the main, more or less, but here again the approximate length given shall not revent the use of a longer or shorter cone 1f necessary. The angleof this cone should approximate 14 thou h it may vary to accord with the angle 0 the divergent cone from 7 to 22. As the angle of the divergent cone alters, so the cross section ratio may alter from one to one and a half, to one to nine, and it is permissible to alter the ratio, length of sides of both cones, and the angles, according to the quantity and velocity of flow, to get the best results with the meter tube.

In Fig. 2, the sides of the convergent cone D, are shown curved instead of straight.

This curve is of a paraboloid nature, but may be represented for all practical purposes (as it is in the drawing) by the arc of a circle whose radius is from 12 to 16 times the internal diameter of the main. In Fig. 3, a short cylindrical length is shown introducedbetween the two cones. Its width should not be greater than the internal diameter of the main, its use being to give greater facilities for attachment of the pressure tubes and to steady the flow 5 of water while passing them.

. I may-use both types of cones shown in Figs. 1 and 2, either with orwithout the short cylindrical length.

What I claim is 1. In an apparatus for measuring fluid passing through a conduit,a pair of conical tubes having their larger ends facing each other, the smaller end of each tube being connected to the conduit whereby fluid passing through the conduit will pass through said tubes, the tubes providing divergent and convergent fluid conductors, the

connected to the conduit whereby fluid .passing through the conduit will pass' through said tubes, the tubes providing divergent and convergent fluid conductors, the fluid to be measured passing first through the diverging and then through the'converging tubes, and means for conducting the fluid to be measured from a point adjacent the juncture of the larger ends of the tubes and from a point in the conduit, said means in each instance comprising a high pressure tube branching at its connecting end into a plurality of branches, substantially as and for the purpose described.

o. GORDON BRODIE, I

lVitnesses:

I. D. Room, 0. J. WORTH. 

